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Cardiovascular responses during orthostasis - Effect of an increase in maximal O2 uptakeA study is described which tests the hypothesis that changes in aerobic activity (increases in maximum oxygen uptake) will reduce the effectiveness of cardiovascular reflexes to regulate blood pressure during orthostasis. The hypothesis was tested by measuring heart rate, blood pressure and blood volume responses in eight healthy male subjects before and after an eight-day endurance regimen. The results of the study suggest that the physiologic responses to orthostasis are dependent upon the rate of plasma volume loss and pooling, and are associated with training-induced hypervolemia. It is indicated that endurance type exercise training enhances cardiovascular adjustments during tilt. The implications of these results for the use of exercise training as a countermeasure and/or therapeutic method for the prevention of cardiovascular instability during orthostatic stress are discussed.
Document ID
19840060943
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Convertino, V. A.
(NASA Ames Research Center Moffett Field, CA, United States)
Montgomery, L. D.
(NASA Ames Research Center Moffett Field, CA, United States)
Greenleaf, J. E.
(NASA Ames Research Center Moffett Field, CA; Arizona, University, Tucson, AZ, United States)
Date Acquired
August 12, 2013
Publication Date
August 1, 1984
Publication Information
Publication: Aviation, Space, and Environmental Medicine
Volume: 55
ISSN: 0095-6562
Subject Category
Aerospace Medicine
Accession Number
84A43730
Funding Number(s)
CONTRACT_GRANT: NCA2-OR-180-703
Distribution Limits
Public
Copyright
Other

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